313121217 has 12 divisors (see below), whose sum is σ = 423837456. Its totient is φ = 205623000.

The previous prime is 313121209. The next prime is 313121219. The reversal of 313121217 is 712121313.

It is a happy number.

It is not a de Polignac number, because 313121217 - 2³ = 313121209 is a prime.

It is a super-2 number, since 2×313121217² = 196089793071122178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 313121193 and 313121202.

It is not an unprimeable number, because it can be changed into a prime (313121219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1842 + ... + 25092.

It is an arithmetic number, because the mean of its divisors is an integer number (35319788).

Almost surely, 2^313121217 is an apocalyptic number.

It is an amenable number.

313121217 is a deficient number, since it is larger than the sum of its proper divisors (110716239).

313121217 is an equidigital number, since it uses as much as digits as its factorization.

313121217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23388 (or 23321 counting only the distinct ones).

The product of its digits is 252, while the sum is 21.

The square root of 313121217 is about 17695.2314763046. The cubic root of 313121217 is about 679.0537711470.

The spelling of 313121217 in words is "three hundred thirteen million, one hundred twenty-one thousand, two hundred seventeen".